RFR: 8308807: [AIX] MulticastSocket and jdp test fails due to joinGroup

[Christoph Langer]

On Sat, 10 Jun 2023 06:42:32 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> @MBaesken @RealCLanger I wonder if you might have a bit of time to comment on this issue. If I read Deepa's comment correctly, she is saying that IPv6 UDP sockets on AIX cannot join IPv4 multicast groups. The spec doesn't require this but it problematic for MulticastSocket (as it has been since Java 4 when IPv6 was added). The part that I'm wondering about is why this issue might be coming up now. As I understand, SAP have supporting/maintaining/testing on AIX for a long time. Maybe your systems don't have IPv6 enabled so you never run into this?

Well, in that area we always had deviations on AIX, so definitely this rings a bell. However, since AIX was not the most important platform for us and that particular IPv6/IPv4 multicast feature didn't seem to be mission critical and wouldn't fail TCK tests, we rather resorted to excluding some tests internally, I believe. But it would be good to really resolve this compatibility/spec/documentation issue, if possible.

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PR Comment: https://git.openjdk.org/jdk/pull/14142#issuecomment-1586887143